DS (9) is a terrible computer game addict, given the opportunity he'd play all day long every day (instead he's allowed about 4 hrs/week). He has enough Christmas money to buy a DS Lite, but I'm quite certain that he'll go overboard with that, too!!
If we let him get the DS Lite (big IF) we would probably just call it another form of screen/'puter time, and he'd have to use it within his existing quota. What management regime anyone else might have for these things?
Alternatively, can you help me talk him out of wanting it? I can't believe the games are better than what he can already play on miniclip, etc.